As name say this Amplifier Speaker Turn-On Delay Circuit wait few seconds before connecting speaker to amplifier. When amplifier is first turn ON then big “thump” noise can happen and this delay stop that bad sound. Circuit Working: Parts List: Components Values Quantity Resistors 33k 1/4 watt 2 1k 1/4 watt 1 Capacitors Electrolytic 100μF […]
Hobby Circuits
Tachometer Circuit
This easy to build Tachometer Circuit is a small DIY tool to check speed of rotating shaft or disc; we used tachometer to know how fast shaft or wheel spin in RPS (revolutions per second). Furthermore, this simple circuit uses two 7-segment displays and one slotted opto sensor MOC7811 where all parts are easy to […]
TV Remote Signal Jammer Circuit
The 555 IC is used in this TV Remote Signal Jammer Circuit because it generates fake IR signals similar to a remote, as a result, the TV becomes confused. Furthermore, TV can not get the real remote signal, so we can watch the show without anyone changing the channel. Also, parts used to complete this […]
Simple Wireless Mobile Phone Charging Circuit
To begin with, this article talk about two main parts for wireless phone charging: So, making Simple Wireless Mobile Phone Charging Circuit is easy and for that we only need resistors, capacitors, diodes, voltage regulator, copper coils and transformer to make circuit work good. Transmitter Circuit Working: Parts List: Components Values Quantity Resistor 1k 1/4 […]
Simple Door Open Alarm Circuit using Reed Switch
Simple Door Open Alarm Circuit using Reed Switch uses reed switch which makes alarm sound when door opens; this simple circuit help protect door from people not allowed. Also, it have reed switch, transistors, resistors, buzzer, diode and LED and here, reed switch control power to alarm. Circuit Working: Parts List: Components Values Quantity Resistors […]
Simple FM Microphone Transmitter Circuit
FM mic transmitter is small device and it changes sound from mic into radio signal. FM radio can hear it in short distance and this Simple FM Microphone Transmitter Circuit uses one NPN BC547 transistor., even it is small it can send FM signal pretty far. Circuit Working: Parts List: Components Values Quantity Resistors 330Ω […]